isql.builder
Class ExpressionBuilder

java.lang.Object
  isql.builder.ExpressionBuilder

Direct Known Subclasses:

SelectExpressionBuilder, WhereExpressionBuilder

public abstract class ExpressionBuilder
extends java.lang.Object

From the parsed expressions (in the select part or in the where part of the SQL statement) extracts expression trees that can be used to calculate the result set

Author:

SHZ Oct 11, 2007

Constructor Summary

ExpressionBuilder(ColumnValues values)
Constructor

Method Summary

IConstant	buildConstant(ISQLSelectParser.IConstant constant) Builds a constant object from an ANTLR parsed constant (t can be a numeric, text, date, boolean)
IExpression	buildExpression(ISQLSelectParser.IExpression expression) The main method to extract the expression tree from an ANTLR parsed expression.
static ColumnKey	buildTableColumn(ISQLSelectParser.TableColumn tableColumn) Builds a table column object from the column identifier coming from ANTLR
static java.sql.Timestamp	fromPartialString(java.lang.String partial) extracts a date (Timestamp) from a date string

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ExpressionBuilder

public ExpressionBuilder(ColumnValues values)

Constructor

Parameters:

values - the columns built from the arrays matching the select items

Method Detail

buildExpression

public IExpression buildExpression(ISQLSelectParser.IExpression expression)
                            throws ISQLException

The main method to extract the expression tree from an ANTLR parsed expression.

Parameters:

expression - the ANTLR expression

Returns:

the expression tree that will be used to execute the query

Throws:

ISQLException

buildTableColumn

public static ColumnKey buildTableColumn(ISQLSelectParser.TableColumn tableColumn)

Builds a table column object from the column identifier coming from ANTLR

Parameters:

tableColumn - the ANTLR column identifier

Returns:

the column identifier

buildConstant

public IConstant buildConstant(ISQLSelectParser.IConstant constant)
                        throws java.lang.AssertionError,
                               ISQLException

Builds a constant object from an ANTLR parsed constant (t can be a numeric, text, date, boolean)

Parameters:

constant - the constant coming from ANTLR

Returns:

the constant (text, number...)

Throws:

java.lang.AssertionError

ISQLException

fromPartialString

public static java.sql.Timestamp fromPartialString(java.lang.String partial)
                                            throws java.lang.IllegalArgumentException

extracts a date (Timestamp) from a date string

Parameters:

partial - the date string

Returns:

the extracted date

Throws:

java.lang.IllegalArgumentException